MCQWeek2. All arise from the common flexor origin. The posterior aspect of the medial epicondyle is the common flexor origin.

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1 MCQWeek2. 1. Regarding superficial muscles of anterior compartment of the forearm: All arise from the common flexor origin. The posterior aspect of the medial epicondyle is the common flexor origin. Flexor carpi radialis lies medial to pronator teres. All have additional areas of origin other than the medial epicondyle. The radial nerve lies deep to pronator teres. Answer: A 2. The flexor aspect of the forearm: The tendon of flexor carpi radialis lies on the triquetral at the wrist. All five superficial muscles are supplied by the median nerve. The tendons to the middle and ring finger of FDS lie superficial to those of the index and little fingers. The median nerve lies on the deep aspect of flexor digitorum profundus. The FDS flexes the wrist and elbow while extending the interphalangeal joints. Answer: C 3. Regarding the deep flexor muscles of the forearm: The tendons of the FDP remain partly attached to each other as they cross the wrist. The flexor pollicis longus arises principally from the ulna. Flexor pollicis longus is the only flexor of the lip joint of the thumb.

2 All the deep muscles are supplied solely by the median nerve. The forearm muscles receive blood supply from the common interosseous branch of the radial artery. Answer: C 4. Regarding the cubital fossa: The roof of the fossa is made up on the lateral side by the bicipital aponeurosis. The contents include from medial to lateral median nerve and brachial artery biceps tendon. The radial nerve gives off branches to extensor carpi radialis longus and brevis prior to dividing into its 2 terminal branches. The brachial artery divides outside the cubital fossa. The posterior interosseous nerve is a branch of the median nerve. Answer B 5. Regarding the posterior compartment of the forearm: Brachioradialis lies superficially in the forearm along its entire course. The common exterior origin is on the posterior surface of the lateral epicondyle. Extensor carpi radialis longus arises from the common extensor origin. Wrist extension is a CaT1 root function. Supinator is not the main supinator of the forearm. Answer: E

3 6. Regarding forearm muscles: Abductor pol/icis longus arises from both forearm bones. Abductor pol/icis longus and extensor pol/icis longus from the radial side of the snuff box. The basilic vein commences in the snuff box. The posterior interosseous nerve passes deep to the origin of abductor pollicis longus. The main blood supply to the muscles of distal extensor compartment is the posterior interosseous artery. Answer: A 7. Regarding the wrist and hand: Structures passing superficial to the flexor retinaculum include the fol/owing except: The ulnar nerve. Ulnar artery. Hypothenar muscles. Palmar branch of median nerve. Flexor carpi radialis. Answer: E 8. Regarding extensor retinaculum: Is attached to the pisiform and hamate bones. Extensor indicis passes beneath the retinuculum in its own synovial sheath.

4 The most lateral compartment transmits extensor carpi longus and brevis. Is attached to the ulna. The pisiform is the only bone in the wrist to which both the extensor and flexor retinculum attach. Answer: E 9. Tendon directly medial to dorsal (Lister's) tubercle of radius: Extensor pollicis brevis Extensor pollicis longus ( c) Extensor indicis Extensor carpi radialis longus Extensor carpi radialis brevis Answer: B 10. Directly behind palmaris longus at the wrist lies the: Flexor carpi radialis Flexor pollicis longus Ulnar artery Radial artery Median nerve Answer:: E

5 11. The carpal bones articulating with the radius are: Scaphoid and pisiform Lunate and pisiform ( c) Lunate and trapezium Lunate and scaphoid Scaphoid and capitate Answer: The interosseous membrane of the forearm: Is pierced by posterior interosseous vessels Is pierced by anterior interosseous vessels Forms the axis of rotation in movements of pronation and supination Is most stretched in full supination Answer:E 13. The medical cutaneous nerve of the forearm: Originates from C8 and T1 nerve roots Pierces the deep fascia at mid-arm Supplies part of the arm below and above the elbow All of the above

6 Answer: D 14. The surface marking of the median nerve is: From the mid point of the cubital fossa to the mid point of the wrist From the mid point of the cubital fossa to the radial side of flexor carpi radialis tendon at the wrist From the cubital fossa, medial to the brachial pulse to the ulnar side of flexor carpi radialis tendon at the wrist From the cubital fossa, lateral to the brachial pulse to the radial side of flexor carpi radialis tendon at the wrist From the cubital fossa, lateral to the brachial pulse to the ulna side of flexor carpi radialis tendon at the wrist Answer: C 15. Flexor digitorum profundus: Is the most powerful and bulkiest of the forearm muscles Arises from both radius and ulna Has the lumbricals inserting into its tendons All of the above Answer: A

7 16. Flexor pollicis longus: Arises from the radius only Is multipennate Receives a dual innervation Lies deep to flexor carpi radialis in the carpal tunnel Acts only on the thumb Answer: The extensor compartment of the forearm. Is supplied entirely by the posterior interosseous nerve Contains ten muscles Is supplied by both the anterior and posterior interosseous arteries Does not contain the anconeus muscle Answer: C 18. The brachial artery: Lies medial to the biceps tendon in the cubital fossa Divides into its terminal branches just above the cubital fossa Has the basilic vein lateral to it

8 Is crossed in the mid-upper arm from medial to lateral side by the median nerve Answer: A 19. Flexor digitorum superficialis: Arises from the humerus and ulna only. In the forearm has the median nerve on it's deep surface. Has a nerve supply from both median and ulnar nerves. Is supplied by the ulnar nerve Inserts into the distal phalanges of the finger Answer: B 20. Muscles arising from the medial epicondyle include all EXCEPT: Flexor carpi ulnaris Flexor carpi radialis Pronator teres Flexor digitorum superficialis Flexor pollicis longus Answer: E

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